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1. 发明专利

JPH05223380A CRYOGENIC COOLING APPARATUS 失效
公开(公告)号：JPH05223380A
公开(公告)日：1993-08-31
申请号：JP2780492
申请日：1992-02-14
申请人： HITACHI LTD
发明人： MATSUMOTO KOZO , OKAMOTO KAZUO
IPC分类号： F25B9/06 , F25B9/02
摘要： PURPOSE:To provide a cryogenic cooling apparatus capable of thermodynamically effectually dealing with various operation modes with minimum expansion turbines by disposing an expansion turbine used by switching to a cooling stage and a precooling stage and employing a variable capacity type expansion turbine. CONSTITUTION:In a precooling stage I high pressure gas supplied from a line 8 is heat-exchanged with nitrogen supplied from a line 10 in a first heat exchanger 1. Part of shunted gas is expanded in a first expansion turbine 6 and is cooled in a fourth heat exchanger 4, and is thereafter expanded in a second expansion turbine 7 into a low pressure gas blow. Remaining part of the shunted gas is cooled in succession in third to fifth heat exchangers 3 to 5 into a high pressure gas fluid. In a cooling stage II, the high pressure gas fluid is cooled in a first heat exchanger 11 and is expanded in a first expansion turbine 14 and is further cooled in a second heat exchanger 12. Thereafter, the gas and the fluid are supplied to a consumer 20 via a second expansion turbine 15, a third heat exchanger 13, and an expansion valve 17.

2. 发明专利

JPH05196314A HELIUM LIQUEFACTION REFRIGERATING PLANT 失效
公开(公告)号：JPH05196314A
公开(公告)日：1993-08-06
申请号：JP547892
申请日：1992-01-16
申请人： HITACHI LTD
发明人： HARADA SUSUMU , UEDA HIRONOBU , OKAMOTO KAZUO
IPC分类号： F25B9/06 , F25B9/02
摘要： PURPOSE:To provide a highly efficient expansion turbine by controlling the opening of a variable nozzle of a capacity variable expansion turbine and supply a helium liquefaction refrigerating plant which is excellent in refrigerating power and control performance as well. CONSTITUTION:An output signal of a flow meter 5 installed to a helium has branch line 3 is compared with a specified flow rate in refrigeration mode. A predetermined value is attained by controlling the opening of variable nozzles of capacity variable expansion turbines 6 and 7 by means of a controller 23. Therefore, this construction makes it possible to control the opening of the variable nozzles of the capacity variable expansion turbines to the optimum by allowing the liquefaction mode of a helium liquefaction refrigerating plant to conform to its refrigeration mode, thereby producing the effect of enhancing the efficiency of the turbines and providing a refrigerating plant which is excellent in refrigeration power.

3. 发明专利

JPH04369356A CRYOGENIC REFRIGERATOR 失效
公开(公告)号：JPH04369356A
公开(公告)日：1992-12-22
申请号：JP14709991
申请日：1991-06-19
申请人： HITACHI LTD
发明人： UEDA HIRONOBU , HARADA SUSUMU , OKAMOTO KAZUO
IPC分类号： F25B9/06 , F25B9/02
摘要： PURPOSE:To provide a cryogenic refrigerator which simplifies a device and forms a cooler in a compact state. CONSTITUTION:Vaporization nitrogen gas generated resulting from heat- exchange between liquid nitrogen used as an auxiliary cold source and high pressure high temperature helium gas delivered from a compressor 1 is applied to a refrigerant for coolers 16 and 17 for a brake line for expansion turbines 12 and 13. Since, as noted above, vaporization nitrogen gas for the auxiliary cold source is applied to the cooler of the brake line for the expansion turbines, availability of a refrigerant is improved, a device can be simplified, and a cooler can be formed in a compact manner.

4. 发明专利

JPH0427361B2 失效
公开(公告)号：JPH0427361B2
公开(公告)日：1992-05-11
申请号：JP5229285
申请日：1985-03-18
申请人： HITACHI LTD
发明人： IHARA KAZUO , OKAMOTO KAZUO , NAKAMOTO HIDEKAZU
IPC分类号： F16C17/03 , F01D1/08 , F01D3/00

5. 发明专利

JPH04124432A CONTROL METHOD FOR TURBINE COMPRESSOR 失效
公开(公告)号：JPH04124432A
公开(公告)日：1992-04-24
申请号：JP24235390
申请日：1990-09-14
申请人： HITACHI LTD
发明人： OKAMOTO KAZUO , NAKATANI YASUO , SOMEYA KAZUO , HASHIMOTO KAZUTAKA
IPC分类号： F02C7/27 , F02C9/18
摘要： PURPOSE:To smoothly increase a rotating speed of a turbine at the time of starting the turbine by reducing a pressure inside a pipe by the use of vent means, and opening a turbine inlet valve, before gradually opening a compressor intake valve for rotation. CONSTITUTION:In an operating procedure at the time of starting, a pressure between a compressor intake valve 1 and a turbine inlet valve 2 is first decreased by a vent means 7 in a turbine inlet line, and then, the turbine inlet valve 2 is wholly opened, before the compressor intake valve 1 is gradually opened, thus rotating a turbine. Accordingly, process gas passes through a compressor, and further through the turbine inlet valve 2 into the turbine, thus applying rotating energy to a turbine wheel 4 for rotation of the turbine. The rotation is started at small axial thrust exerting on a thrust bearing and at a low turbine inlet pressure. Therefore, a rotating speed of the turbine can be smoothly increased without damaging the thrust bearing.

6. 发明专利

JPH03265712A MAGNETIC BEARING DEVICE FOR BODY OF ROTATION 失效
公开(公告)号：JPH03265712A
公开(公告)日：1991-11-26
申请号：JP6419590
申请日：1990-03-16
申请人： HITACHI LTD
发明人： OKAMOTO KAZUO , NAKATANI YASUO , HARADA SUSUMU
IPC分类号： F16C32/04
摘要： PURPOSE:To improve safety in the high-speed rotation region by arranging a body of rotation a part of which is made of a magnetic material, and a control type electromagnet, and adjusting attractive force of the electromagnet in accordance with output of a revolution indicator. CONSTITUTION:A body of rotation consists of a rotary shaft 6 made of a magnetic material, a disc wheel 1, the rotor 3 for a driving motor, and a thrust collar 7, and gas bearing type journal bearings 2a, 2b and a thrust bearing 5 are arranged as bearings. Further, a control type electromagnet 8 is arranged at a position spaced a specified interval apart from the shaft end of the body of rotation, and a control circuit is composed of a rotating speed detecting sensor 9, a revolution indicator 10, etc. With increasing the rotating speed of the body of rotation, axial thrust is increased, and because the load on the thrust bearing 5 supporting the axial thrust is reduced, the magnetic bearing control circuit operates to increase attractive force of the electromagnet 8. The change in attractive force is caused by the change in current or voltage of an electric power unit 12 in accordance with the rotating speed detected by the revolution indicator-sensor 9. Safety in the high-speed rotation region can thus be increased.

7. 发明专利

JPH0350334A AIR BLOWING METHOD FOR COMBUSTION 失效
公开(公告)号：JPH0350334A
公开(公告)日：1991-03-04
申请号：JP18467489
申请日：1989-07-19
申请人： HITACHI LTD , DAICEL CHEM
发明人： OKAMOTO KAZUO , ISHIZU HISAZUMI , OOMORI SOUHACHIROU , ASANUMA HIDEO
IPC分类号： F02C6/06
摘要： PURPOSE:To obviate the use of an air blower dedicated to the combustion air and reduce the power consumption of a system by stepping up the power of an expansion turbine with the atmosphere in a booster provided at the the side of a brake and using the stepped up power for the combustion air. CONSTITUTION:Process gases such as the air are first introduced into an expansion turbine 1 and adiabatically expanded into gases of low pressure and temperature. In this case, generated power is consumed to increase the pressure of a hydraulic fluid for flowing through a booster 3 with the atmosphere via a rotating shaft 2. For the hydraulic fluid, the atmosphere is drawn through an intake filter 4. In addition, a part of the stepped up air is introduced into a combustion furnace as the combustion air 8 via a valve 5 and a flow control valve 7. Furthermore, the remnant of the stepped up air is discharged to the atmosphere via the pressure regulating valve 6 of the booster 3. According to the aforesaid construction, an air blower dedicated to the supply of the combustion air 8 can be eliminated and the power consumption of a system is thereby reduced.

8. 发明专利

JPH0158768B2 失效
公开(公告)号：JPH0158768B2
公开(公告)日：1989-12-13
申请号：JP10830884
申请日：1984-05-30
申请人： HITACHI LTD
发明人： SAHO NORIHIDE , MATSUDA NORIMOTO , HARADA SUSUMU , IMAMURA MINORU , OKAMOTO KAZUO , AWATA YOSHIHISA , KAJIWARA HIROTAKE
IPC分类号： F16C17/03

9. 发明专利

JPH0158767B2 失效
公开(公告)号：JPH0158767B2
公开(公告)日：1989-12-13
申请号：JP17290683
申请日：1983-09-21
申请人： HITACHI LTD
发明人： IHARA KAZUO , OOTA TERUO , OKAMOTO KAZUO
IPC分类号： F16C17/03

10. 发明专利

JPH0156245B2 失效
公开(公告)号：JPH0156245B2
公开(公告)日：1989-11-29
申请号：JP1956083
申请日：1983-02-10
申请人： HITACHI LTD
发明人： IHARA KAZUO , OOTA TERUO , OKAMOTO KAZUO , NAKATANI YASUO
IPC分类号： F01D17/00 , F01D21/00 , F01D25/00 , F01D25/20

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